Apparatus for dynamically changing stitch length in a double loc

Details Apparatus for dynamically changing stitch length in a double loc Apparatus for dynamically changing stitch length in a double loc

1990-12-26

1992-03-10

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

112315, D05B 2722

Patent

active

050941801

ABSTRACT:
Apparatus for changing the stitch length of double lock stitch sewing machine while the machine is in operation. The apparatus including a first transmission having a variable transmission ratio that can be connected to the machine needle rocking assembly, and a second transmission having a variable transmission ration that can be connected to the machine feed dog assembly. Additionally, the apparatus includes an actuator connected to the first and second transmission that may be activated by a machine operator for synchronously changing the transmission ratio of the first and second transmission to effect change in the machine stitch. Both the first and second transmission include input and output lever elements for connecting the respective transmission to the machine needle rocking assembly and feed dog assembly, and a movable coupling assembly for connecting the input and output elements of the respective transmission together to facilitate change of the transmission ratio on movement of the respective coupling assembly by the apparatus actuator.

REFERENCES:
patent: 3521585 (1970-07-01), Rouha
patent: 3687096 (1972-08-01), Smith
patent: 3970018 (1976-07-01), Hager
patent: 4619214 (1986-10-01), Baruffa et al.
patent: 4643113 (1987-02-01), Schiudde et al.
patent: 4781134 (1988-11-01), Horie

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